| Algebra 1 Notes
Chapter Seven
Section 7.1
Section 7.2
Section 7.3
Section 7.4
Section 7.5
Section 7.6
Section 7.7
Section 7.8
Section 7.9
Section 7.10
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Section
7.3 Linear Equations and Their Graphs
(Examples provided by Prentice
Hall)
Part I: Linear Equations
Graph the equation.
| Example
1 |
|
2y
+ 6x = 4
Solve for y and find three solutions.
2y + 6x = 4
y = –3x + 2
If x = 0, y = –3(0) + 2 = 2
If x = 2, y = –3(2) + 2 = –4
If x = –1, y = –3(–1) + 2 = 5
Graph the ordered pairs (0, 2), (2, –4), and (–1, 5) and
connect with a straight line. |
Part II: Graphing Using Intercepts
| Example
1 |
|
2x
+ 5y = 10
Let x = 0, then 5y = 10 and y = 2.
This gives the y-intercept
(0, 2).
Let y =
0, then 2x = 10 and x = 5.
This gives the x-intercept
(5, 0).
Graph the
intercepts and connect with a straight line.
|
Part III: Graphing Horizontal and Vertical Lines
Graph each equation.
| Example
1 |
|
y
= –2
Any pair of the form (x, –2) is a solution. There is no
restriction on the x value. The line is parallel to the x-axis
with y-intercept –2. |
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| Example
2 |
x
= 3
Any pair of the form (3, y) is a solution. There is no
restriction on the y value. The line is parallel to the y-axis
with x-intercept 3. |
Take class notes.
Before starting your homework, rework the
examples that are illustrated in this section of your textbook and the
examples that I demonstrated in class.
Then do your homework.
Write down questions (examples or concept
that you do not understand).......then.............. Ask these questions
in class.
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